Parsing throws NumberFormatException: For input string: "post" in SwaggerConverter

The following is thrown:

java.lang.NumberFormatException: For input string: "post"
	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
	at java.base/java.lang.Integer.parseInt(Integer.java:668)
	at java.base/java.lang.Integer.parseInt(Integer.java:786)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:1140)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:608)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:531)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:250)
	at io.swagger.v3.parser.converter.SwaggerConverter.readResult(SwaggerConverter.java:104)
	at io.swagger.v3.parser.converter.SwaggerConverter.readLocation(SwaggerConverter.java:85)
	at io.swagger.v3.parser.OpenAPIV3Parser.read(OpenAPIV3Parser.java:124)
	at io.swagger.v3.parser.OpenAPIV3Parser.read(OpenAPIV3Parser.java:113)
	at redacted
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)

Running:

new OpenAPIV3Parser().read("swagger.json");

with swagger-parser-v2-converter-2.1.20.jar.
For the attached input.
swagger.json

Start at SwaggerConverter.java line 1140 and trace the conversion path reached by OpenAPIV3Parser.read("swagger.json"). Reproduce the failure with the attached swagger.json and identify why "post" is parsed as an integer. Done means the attached input is read without NumberFormatException and the regression is covered by an appropriate parser test.